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    <title>10.流程控制-分支结构-三元表达式-练习1</title>
    <script>
        //数字补0
        //1.弹出输入框 让用户输入数字
        var time = prompt('请输入数字');
        var result = time < 10 ? '0' + time : time;
        alert(result);
    </script>
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